218686812 has 24 divisors (see below), whose sum is σ = 510515712. Its totient is φ = 72860400.

The previous prime is 218686801. The next prime is 218686837.

218686812 is nontrivially palindromic in base 10.

218686812 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37237 + ... + 42707.

It is an arithmetic number, because the mean of its divisors is an integer number (21271488).

Almost surely, 2^218686812 is an apocalyptic number.

It is an amenable number.

218686812 is an abundant number, since it is smaller than the sum of its proper divisors (291828900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218686812 is a wasteful number, since it uses less digits than its factorization.

218686812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8809 (or 8807 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 218686812 is about 14788.0631591835. The cubic root of 218686812 is about 602.4775444303.

It can be divided in two parts, 21868 and 6812, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 218686812 in words is "two hundred eighteen million, six hundred eighty-six thousand, eight hundred twelve".